Machine for sawing stone



(No Model.)

J. PECKO'VER.

v MACHINE FOR SAWING STONE.

No. 390,0s4.

J s R 9 (i r as '1. H'- n' .1 ma 1 P J II n I l H 5 4 \8 i: Q? I a v5 -x 3 a '//F'\1\ I K [I I I l WwLe-ssesf fro Pa ented' Sept. 2

2 Sheets-*Sheet 1.

2 Sheets-Sheet 2.

(No Model.)

J. PEOKOVER.

MACHINE FOR SAWING STONE. 7 No.. 390,034. Patented Sept. 25, 1888.

a a 7 .f- M f J J 0 0 6 d J (Z 1 5 Iiwordor: Journos Teokm zr 5 his fliiornq s NITED STATES ATENT .FFECE.

MACHINE FOR SAWING STONE. v

SIECIPICA TION forming part of Letters Patent No. 390,034, dated September 2 5, 1888.

Application filed Aprili'GJBflB. Serinl No. 211,916. m m.

ll'o-allwhom it may concern.-

Be it known that I, J muss Pncirovnma subject of the Queen of GreatBritain and Ireland, residing at Philadelphia, Pennsylvania, have 5 invented certain Improvements in Machines for Sawing Stone and other Materiahol which the following is a specification.

The object of my invention is to facilitate the sawing of stone, and this object I attain by the use of a series of circular saws of different diameters, and so arranged that the saw of smallest diameter acts upon the stone first, and that of the largest diameter last, so that a kerf of gradually increasing depth is I formed as the stone is moved past the saws.

In the accompanying drawings, Figure 1 is a longitudinal section of my improved stone sawing machine. 'Fig. 2 is a view, partly in elevation and partly in transverse section, on

the line 1 2. Fig. 3 is a perspective view of part of one of the sawblades, and Fig. 4 a diagram of the belt-shifting devices.

Ais the fixed frame of the machine, on which L are bearings b for the saw-spindles B, six of which are shown in the present instance, al-

though more or less than this may he used, if desired. These saw-spindles are constructed in the same manner as ordinary circular-saw spindles, and have clamp-washers d for the saws D D D D D I), and each of the spindles is driven by a belt passing over a belt-pulley, G, on one end of the spindle, all of the saws being driven at the same speed, or some at a higher speed than others, as circumstances re- 3 5 quire.

The smaller-sized saws I prefer to make in one piece, as shown; but the larger saws I make up of a series of segments or plates sccured together by means of double dovetailed 4o keys'E fitting in dovetailed notches c in the tapered faces of the segments, so that when two segments are placed together the keys E may be inserted in the dovetailed notches to hold the segments in place. The opposite bev- 4 5 eled edges of the keys are preferably grooved and the edges of the notches in the segments tongued for adaptation thereto, as shown in Fig. 3, the keys being bent so that they can enter the notches, and being expanded so as tofill the notches, in a manner substantially similar to that set forth in my patent, No.

381,811, dated April 24, 1888, as a method of securing teeth to sawbladcs.

The keys are thicker than the saw-blade, so as to form projections on each side of the blade, 5 5

' these projections, when" the saw enters the kerf in the stone, tending to steady the saw in its movement, for it should be understood that the sand and water used in connection with the saws cause the formation of a kerf wider than the thickness of the saw-blade. The saws have curved teeth,which act with the curved faces in advance, so as to drive the sand or other abrading material forward and down-' ward into the. kerf, and thus insure the best cutting efi'ect.

Mounted-above the saws is a sand-trough, F, having tubes'f, which lead in front of the saws, as shown in Fig. 1, and G is a watersupply pipe havinga pendent tube, 9, infro'nt of each saw, this tube being so set in relation to the sand-tube that the water will feed the. same to the kerf formed by the saw at the proper poi ut.

Mounted on suitable rails, H II, on the base of the machine is a carriage'or truck, Lhaving suitable wheels, 2' This truck is provided with a hook,j, in front, and a draft- 4 rope, J, is attached to this hook and con: nected to. any winding-engine, the drum of which is shown by dottedlines in Fig. 1, this engine being of any ordinary construction,.or other mechanism-such as a hand-' windlassbeing used without departing from my invention.

On the truck I is mounted the stone to he sawed, the top of the stone being set a little above the cutting-edge of the first or smallest saw, I), of the series, as shown in Fig 1. When the winding-engine is put in motion, therefore, the carriage I will be drawn slowly toward the saws and the first saw will cut a shallow kerf in the stone, the next saw deep ening the kerf, the next saw cutting it still deeper, and so on, the last saw, l)", of the se- .ries being preferably-of such diameter as to finish the cutting of the kerf through the stone.

I have SllOWll four saws IllOlllltCd Oil 0110i! spindle; but it will be evident that more or less than four saws may be used on each spindle, depending upon the character of the work for which the machine is intended; in the present instance I provide the saw-spindles with fast and loose pulleys C, and provide each pair of pulleys with a shipper, -M, through which the driving-belt passes. Each shipper-lever is mounted on a rertimlshaft,

N, adapted .to suitable bearings, n, on the frame of the machine, and this vertical shaft has near its lower end an arm, M, which pro.-

jects into the path of the carriage I.--.. Aspr'ing,

Z, acting upon-an arm, m, tends to keep the.

parts in such position as to throw the belt upon the loose pulley C; but when the arm M is struckand moved by the ca'rriagein the.

movable belt, a clutch of theordinary construction may be used'without departing from my invention.

Theabove-described mechanism may lie-used in sawing other material than stonesnch'a s wood and met l-without departing. from my,

invention, the saws in such case, however, be

ing modified as required by the dit ferent character-of the work to be performed.

it will be .ev.ident,also,that the stone may be ifixefd and. the saw-carryingHallie-traversed in' respect thereto without departing from my invention, although the construction shown in I the drawings is preferred.

I claim as my invention- 1.- -Tlie combination ofa'stone-carrier, a saw-,- +0 carrier having a series" of s'aws ot' difl'erent diameters mounted in line, one in advaneeot another, means. for moving one of said: carriersin respect to the-other, and sand-feeders discharging into thekerf infadvanoo of '45- saw of the series, all suhstantially'a's specified.

2. .The combination, in} a sectional circular saw, of a series of segments having dovetailed notches in their edges, with double dovetailed keys fitting in said notches, said keys. being thicker than the bladef the saw, all" sub." stantially as and for the purpose set forth.

3. The combination of thes'tone-carrier,.the

saw-carrying frame having'a 'serie's' of saws .v

of diflerent diameters, stopping and starting, mechanism for each 'saw-spindie', .a nd. a con-1 trolling-arm projecting into the pathof' the stone carrier, wherebyas one carrier istraversed .inrespect to the other thesaws will be successively set in motion, substantially as set forth.

In testimony whereof I have signed-my name to this specification inthe presence of ,two subscribing witnesses;

stemming \Vitnesses':

WIL IAM D; CORNER, HARRY SLIITH: 

